6.5
MEDIUM
CVE-2023-6397
Zyxel ATP/USG FLEX RAM Zippo: Null Pointer Dereference Denial of Service
Description

A null pointer dereference vulnerability in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1 and USG FLEX series firmware versions from 4.50 through 5.37 Patch 1 could allow a LAN-based attacker to cause denial-of-service (DoS) conditions by downloading a crafted RAR compressed file onto a LAN-side host if the firewall has the “Anti-Malware” feature enabled.

INFO

Published Date :

Feb. 20, 2024, 2:15 a.m.

Last Modified :

Jan. 21, 2025, 6:47 p.m.

Source :

[email protected]

Remotely Exploitable :

No

Impact Score :

3.6

Exploitability Score :

2.8
Affected Products

The following products are affected by CVE-2023-6397 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Zyxel usg_flex_100_firmware
2 Zyxel usg_flex_100w_firmware
3 Zyxel usg_flex_200_firmware
4 Zyxel usg_flex_50_firmware
5 Zyxel usg_flex_500_firmware
6 Zyxel usg_flex_50w_firmware
7 Zyxel usg_flex_700_firmware
8 Zyxel atp100_firmware
9 Zyxel atp100w_firmware
10 Zyxel atp200_firmware
11 Zyxel atp500_firmware
12 Zyxel atp700_firmware
13 Zyxel atp800_firmware
14 Zyxel atp100
15 Zyxel atp200
16 Zyxel atp500
17 Zyxel atp100w
18 Zyxel atp700
19 Zyxel atp800
20 Zyxel usg_flex_100
21 Zyxel usg_flex_50
22 Zyxel usg_flex_200
23 Zyxel usg_flex_500
24 Zyxel usg_flex_700
25 Zyxel usg_flex_100w
26 Zyxel usg_flex_50w
27 Zyxel usg_flex_100ax
28 Zyxel usg_flex_100h
29 Zyxel usg_flex_200h
30 Zyxel usg_flex_200hp
31 Zyxel usg_flex_500h
32 Zyxel usg_flex_700h
33 Zyxel usg_flex_100ax_firmware
34 Zyxel usg_flex_100h_firmware
35 Zyxel usg_flex_200h_firmware
36 Zyxel usg_flex_200hp_firmware
37 Zyxel usg_flex_500h_firmware
38 Zyxel usg_flex_700h_firmware
: Total Affected Vendor : 1 | Products : 38
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2023-6397.

URL Resource
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024 Vendor Advisory
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024 Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2023-6397 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2023-6397 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Jan. 21, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:atp100_firmware:*:*:*:*:*:*:*:* versions from (including) 4.32 up to (excluding) 5.37 *cpe:2.3:o:zyxel:atp100_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:atp100_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:atp100:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:atp100w_firmware:*:*:*:*:*:*:*:* versions from (including) 4.32 up to (excluding) 5.37 *cpe:2.3:o:zyxel:atp100w_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:atp100w_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:atp100w:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:atp200_firmware:*:*:*:*:*:*:*:* versions from (including) 4.32 up to (excluding) 5.37 *cpe:2.3:o:zyxel:atp200_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:atp200_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:atp200:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:atp500_firmware:*:*:*:*:*:*:*:* versions from (including) 4.32 up to (excluding) 5.37 *cpe:2.3:o:zyxel:atp500_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:atp500_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:atp500:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:atp700_firmware:*:*:*:*:*:*:*:* versions from (including) 4.32 up to (excluding) 5.37 *cpe:2.3:o:zyxel:atp700_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:atp700_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:atp700:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:atp800_firmware:*:*:*:*:*:*:*:* versions from (including) 4.32 up to (excluding) 5.37 *cpe:2.3:o:zyxel:atp800_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:atp800_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:atp800:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:* versions from (including) 4.50 up to (excluding) 5.37 *cpe:2.3:o:zyxel:usg_flex_100_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:usg_flex_100_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:usg_flex_100:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_100ax_firmware:*:*:*:*:*:*:*:* versions from (including) 4.50 up to (excluding) 5.37 *cpe:2.3:o:zyxel:usg_flex_100ax_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:usg_flex_100ax_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:usg_flex_100ax:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_100h_firmware:*:*:*:*:*:*:*:* versions from (including) 4.50 up to (excluding) 5.37 *cpe:2.3:o:zyxel:usg_flex_100h_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:usg_flex_100h_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:usg_flex_100h:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:* versions from (including) 4.50 up to (excluding) 5.37 *cpe:2.3:o:zyxel:usg_flex_100w_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:usg_flex_100w_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:usg_flex_100w:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_200_firmware:*:*:*:*:*:*:*:* versions from (including) 4.50 up to (excluding) 5.37 *cpe:2.3:o:zyxel:usg_flex_200_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:usg_flex_200_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:usg_flex_200:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_200h_firmware:*:*:*:*:*:*:*:* versions from (including) 4.50 up to (excluding) 5.37 *cpe:2.3:o:zyxel:usg_flex_200h_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:usg_flex_200h_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:usg_flex_200h:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_200hp_firmware:*:*:*:*:*:*:*:* versions from (including) 4.50 up to (excluding) 5.37 *cpe:2.3:o:zyxel:usg_flex_200hp_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:usg_flex_200hp_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:usg_flex_200hp:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_500_firmware:*:*:*:*:*:*:*:* versions from (including) 4.50 up to (excluding) 5.37 *cpe:2.3:o:zyxel:usg_flex_500_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:usg_flex_500_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:usg_flex_500:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_500h_firmware:*:*:*:*:*:*:*:* versions from (including) 4.50 up to (excluding) 5.37 *cpe:2.3:o:zyxel:usg_flex_500h_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:usg_flex_500h_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:usg_flex_500h:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_50_firmware:*:*:*:*:*:*:*:* versions from (including) 4.50 up to (excluding) 5.37 *cpe:2.3:o:zyxel:usg_flex_50_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:usg_flex_50_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:usg_flex_50:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_50w_firmware:*:*:*:*:*:*:*:* versions from (including) 4.50 up to (excluding) 5.37 *cpe:2.3:o:zyxel:usg_flex_50w_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:usg_flex_50w_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:usg_flex_50w:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_700_firmware:*:*:*:*:*:*:*:* versions from (including) 4.50 up to (excluding) 5.37 *cpe:2.3:o:zyxel:usg_flex_700_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:usg_flex_700_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:usg_flex_700:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg_flex_700h_firmware:*:*:*:*:*:*:*:* versions from (including) 4.50 up to (excluding) 5.37 *cpe:2.3:o:zyxel:usg_flex_700h_firmware:5.37:-:*:*:*:*:*:* *cpe:2.3:o:zyxel:usg_flex_700h_firmware:5.37:patch1:*:*:*:*:*:* OR cpe:2.3:h:zyxel:usg_flex_700h:-:*:*:*:*:*:*:*
    Changed Reference Type https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024 No Types Assigned https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024 Vendor Advisory
    Changed Reference Type https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024 No Types Assigned https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024 Vendor Advisory
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Received by [email protected]

    Feb. 20, 2024

    Action Type Old Value New Value
    Added Description A null pointer dereference vulnerability in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1 and USG FLEX series firmware versions from 4.50 through 5.37 Patch 1 could allow a LAN-based attacker to cause denial-of-service (DoS) conditions by downloading a crafted RAR compressed file onto a LAN-side host if the firewall has the “Anti-Malware” feature enabled.
    Added Reference Zyxel Corporation https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024 [No types assigned]
    Added CWE Zyxel Corporation CWE-476
    Added CVSS V3.1 Zyxel Corporation AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2023-6397 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2023-6397 weaknesses.

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: